Milton Salomon and John B. SmithThe Effect on Soil of Long-continued Use of Nitrate of Soda and Sulfate of Ammonia as Single Nitrogen Sources
doi:10.2136/sssaj1948.036159950012000C0070xSoil Science Society of America Journal 1948 12:296-299[ Preview (PDF) ][ PDF ][ Get Permissions ]

E. R. Graham and Hall C. TurleySoil Development and Plant Nutrition: III. The Transfer of Potassium from the Nonavailable to the Available Form as Reflected by the Growth and Composition of Soybeans
doi:10.2136/sssaj1948.036159950012000C0078xSoil Science Society of America Journal 1948 12:332-335[ Preview (PDF) ][ PDF ][ Get Permissions ]